Abstract: Objective: To investigate imageological features of giant cell tumrs of bone. Materialsand methods:Imageological feaures of 50 cases of various cell tumors have been analyzed. beults: Basicunageological fhatures of giant cell tuors are eccentic swelling of bone extremities and detriction ofbone. thin and eintire cortex of bone, tenuous and reticular bone crest and no periosteal reaction, forostcolysiccases. discontinuous cota of bone, decrease or dosappearance of bone erest and blurred tumor margins, andfor maligtiant cases, vermiform or ethmoid desmiction of bone at the side of diaphysis and existence ofperioteal triangle and fast-growing soft tissue phmpa.Conclusion: There are defutite characteristic features of giant cell tumor X-ray manifestations. Theinternal structure of giant cell tumors can be detected by CT. Soft tissue diaphysis protruding into the pelvicand abdoninal cavities can be seen with lumbosacral giant cell tumors.